Validation of Web-based Multimedia Dietary Assessment Tools

描述(由申请人提供)：在流行病学研究中，对测量膳食摄入量和体力活动的低成本和准确方法的需求越来越大。这项建议要求资金审查两个新的饮食评估工具的精确度，计算机辅助自访饮食历史(CASI-DH)，它仿照饮食历史的优点，最强大的饮食评估方法之一和一个全自动的多媒体24小时回忆：DIETDAY。CASI-DH是一种基于网络的自我访谈方法，以膳食、音频和食物图片为基础；生成营养和食物摄入量估计；具有广泛的组成部分来评估膳食补充剂的使用并提供反馈，以帮助人们养成更健康的饮食习惯。它在许多重要方面与食物频率问卷不同，因为它是完全定量的，包括数千种食物，以餐为基础，并且不截断食物或消费频率。这里提出的验证研究的目的是通过比较通过CASI-DH获得的自我报告的营养和食物摄入量，并使用DIETDAY在150名非裔美国人和150名高加索成年人的样本中客观地验证生物标记物，来测试这些新工具捕获日常饮食的准确性。具体地说，我们的目标是检验这两种仪器在营养素(总能量、蛋白质和钾)、蔬菜和水果和补充剂使用方面的有效性，使用双标签水表示总能量；24小时尿氮用于蛋白质；尿钾用于膳食钾；以及血液营养素水平(类胡萝卜素和生育酚)用于水果、蔬菜和营养补充剂使用。还将追求一些次要目标，包括验证两份体力活动问卷和两种不同的DLW加速度法。为了研究CASI-DH、DIETDAY和DLW的重复性，将在相隔6个月的时间内对100人进行重复测量。由于其低成本、系统的语言独立性以及依靠图像进行准确的交流，CASI-DH和DIETDAY为评估复杂的饮食暴露而在不同人群中进行流行病学研究提供了独特的机会。CASI-DH或DIETDAY的成功验证将代表着营养流行病学方法学的重要进步。这项研究还将有助于我们在多种族人群中对这些饮食和活动评估工具的信心。

DESCRIPTION (provided by applicant): There is an increasing demand for low cost and accurate methods to measure dietary intake and physical activity in epidemiologic studies. This proposal requests funds to examine the precision of two new dietary assessment tool, the Computer-Assisted Self-Interview Diet History (CASI-DH), which is modeled after the strengths of the diet history, one of the strongest dietary assessment approaches and a fully automated multimedia 24 hour recall: DIETDAY. The CASI-DH is a web-based, self-interview approach that is meal-, audio-, and food picture-based; generates nutrient and food intake estimates; has an extensive component to assess dietary supplement use and provides feedback to help people adopt more healthful dietary habits. It differs in many significant ways from food frequency questionnaires in that it is fully quantitative, includes thousands of foods, is meal-based, and does not truncate foods or frequencies of consumption. The objective of the validation study proposed here is to test how accurately these new tools capture usual diet by comparing self-reported nutrient and food intakes obtained through the CASI-DH and using the DIETDAY to objective validation biomarkers in a sample of 150 African American and 150 Caucasian adults. Specifically, we aim to examine the validity of both instruments for intakes of nutrients (total energy, protein, and potassium), vegetables and fruits and supplement use by using doubly labeled water for total energy; 24-hour urinary nitrogen for protein; urinary potassium for dietary potassium; and blood levels of nutrients (carotenoids and tocopherols) for fruits, vegetables, and nutritional supplement use. A number of secondary aims will also be pursued, including validation of two physical activity questionnaires and two different accelerometry approaches to DLW. To study the reproducibility of the CASI-DH, DIETDAY and DLW, repeat measures will be conducted on a subset of 100 persons 6 months apart. Due to its low cost, the language independence of the system, and the reliance on images for accurate communication, the CASI-DH and DIETDAY present unique opportunities for epidemiologic research in various populations for assessment of complex dietary exposures. Successful validation of either the CASI-DH or the DIETDAY will represent important methodological advances in nutritional epidemiology. The study will also contribute to our confidence in these dietary and activity assessment instruments in multiracial populations.